Exam 5V0-31.23 topic 1 question 44 discussion

Select Default or, if your environment requires specific Bidirectional Forwarding Detection (BFD) configuration, select Custom. https://docs.vmware.com/en/VMware-Cloud-Foundation/5.1/vcf-admin/GUID-D17D0274-7764-43BD-8252-D9333CA7415A.html

This question is asking about the Edge Cluster Profile Type, not the Use Case. Both configuration sections have a "Custom" option. The optional profile types are Default and Custom, and the only option available under a Custom profile type is BFD configuration. See the first table under procedure: https://docs.vmware.com/en/VMware-Cloud-Foundation/5.0/vcf-admin/GUID-D17D0274-7764-43BD-8252-D9333CA7415A.html

If you select the custom use case, you can choose the appliance size to suit your needs. The NSX Edge medium appliance is suitable for most production environments. The NSX Edge large appliance is suitable for environments that require load balancing. The NSX Edge extra-large appliance is suited to very large environments that require load-balancing services. If you choose the custom use case, you can choose between active-active and active-standby high availability options for the Tier-0 gateway. If you require certain services such as NAT, stateful firewall, or VPN, you must choose active-standby.